Fire-box for boilers



C. DUCAS. FIRE BOX FOR BOI LERS.

APPLiCATION FILED JULY 10.. I917.

Patented Sept. 21,1920

4 SHEETS-SHEET I.

W W m w w m m H. M 6 I C. DUCAS.

FIRE BOX FOR BOILERS- APPLICATION FILED JULY 10. 1917.

Pabemad Sept. 21,1920.

4 SHEETS-SHEET 2.

Patentetl Sept. 21, WW.

M o o o o o o 4 SHEETS-SHEET 3.

ifitlzaasels cl mates DUGAS, or New Year, 1v. Y.

FIRE-BOX For; BOILERS.

Specification of Letters Patent. I f t t Sept 1920 W 9 j Applicationfiled July 10, 1917. Serial no. 179,639.

1 '0 aZZ whom it may concern:

Be it known that 1,. CHARLES DUoAs, a citizen of the United States,residing in New York city, in the county of New York and State of NewYork, have invented certain new and useful improvements in Fire- Boxesfor Boilers, of which the following 18 a specification. D

lhis invention relates to improvements in i sectional stayed fire boxes,the primary object of which is to provide a lire-box construction inwhich stay bolts have a universal connection with the outer or wrappersheet of the fire-box and also a universal connection with the inner orcrown sheet thereof whereby all unequal or excessive strains due toexpansion or contraction of the parts or such other strains to which theordinary fire-box is subjected are prevented. Another object of thepresent improvement is to devise a stay bolt so constructed that eachend thereof is universally movably mounted within supports which arecarried by the inner and outer walls of the lire-box.

Another object of this invention is to provide a fire-box constructionin which both the wrapper and crown sheets thereof are sectional, staybolts being connected to 50 the joints of one shell and between thejoints of the other shell.

' A still further object of the present improvement is to constructlire-box using a crown sheet composed of U-shaped sections and slottingthe vertical edges of the L -shaped sections, or otherwise removing aportion of the metal therefrom, whereby the inequality of expansion andcontraction of the horizontal walls relative to that of.

the vertical legs of the sheet is compensated, the inequality ofexpansion being due to the difference in the proximity of the horizontalwalls and vertical legs of the crown sheet to the fire. This equalizingand compensating action will augment the universability of the relationbetween a crown sheet and. wrapper sheet which are connected byuniversally movable stay bolts.

2 A still further object of the present improvement is to providefire-box construction in which the flue sheet, back head and door plateare butt welded to the mud ring,

wrapper and crown sheets permitting the boiler to be made much cheaperthan those Where flanges and rivets are employed, thus Other and furtherobjects of the present improvement will be set forth in detail in thefollowing description and drawin s in which i v u Figure 1 is afragmentary vertical sec-] tional view through one of the flexible staybolts and showing its connection to the wrapper and crown sheets of thefire-box.

7 big. 2' is a vertica' sectional view similar to lug. 1 and takenat'right angles thereto.

Fig. 3 is atop plan view of the brackets which are applied to the jointsof a sectional sheet for receiving one end of a stay bolt. f i

Fig. 4 is a view similar to Fig. 1 encept showing the stay belt appliedto a sectional crown sheet between the joints of which a i stay sheet isinterposed.

Fig. 5 is a fragmentary vertical section through a fire-box in whichboth the crown sheet and wrapper sheet are sectional and showing theattachment of the stay bolts thereto.

Fig. 6 is an end elevation of a fire-box construction provided with myimprove ments showing the same partly broken away to show the fluesheet.

Fig. 7 is an enlarged fragmentary perspective view of one section of thecrown sheet showing the same slotted to compensate for the relativedifference in the expansion and contraction of the horizontal anvertical walls thereof.

Fig. 8 is a vertical sectional view through a fire-box constructed inaccordance with my improvements and showing in detail the welding of theflue sheet, door sheet and back head to the mud ring, crown sheet andwrapper sheet. Y

Fig. 9 is a fragmentary perspective view illustrating the usual methodof connecting the doorplate'and crown sheet.

Fig. 10 is a fragmentary perspective view illustrating the improvedmethod of attaching the door plate to the crown sheet by butt welding.

All of the improvements hereinafter to be described in detail pertain tofireboxes of the Jacobs and Shupert type as illustrated in PatentsNumbers 917,172; 982,723, and 1,054,420, which may be taken as examples.

The constructions illustrated in these patents comprise essentially atire-box having a wrapper and crown sheet with stay bolts between them,the stay bolts bei rig mounted so and the side walls of the crown-sheetmembers being provided with vertical slots to permit oi expansion andcontraction, and prevent distortion of such members by reason oi theunequal heating of the central and side walls of such section members,the universal connections having their universal movable jointsocket-portions located in slots formed in the abutting side walls.

5. A steam boiler fire boX construction, comprising a wrapper-sheet; asectional crown sheet; stay bolt members movably connected at oneendwith the wrapper-sheet by a ball and socket universal-joint, and atthe other end with the sectional crown-sheet; the sections of thecrown-sheet being of substantially lj-shape in cross-section and havingthe side walls thereoi' secured together; and the side walls of thecrown-sheet members being provided with vertical slots to permit ofexpansion and contraction and prevent distortion of such member byreason 0]": the unequal heating of the central and side walls ol suchsection members, the universal connections connecting the stayboltmembers with the sectional crown-sheet members by their socket portionslocated in slots formed in the abutting side walls of the sectionalcrown-sheet members. i

6. A boiler fire-box construction com prising a wrapper-sheet; acrown-sheet composed of a plurality of sections having upstandingabutting side-flanges by which each of the sections is secured to theadjacent abutting sections; ball-joint spheriodally cavitied supportingjournal members secured to the wrapper sheet; bracket or sidesecuringyoke-pieces secured to opposite sides of the upstanding flanges ot' thecrownsheet sections securing them together; a spherically hollowball-joint journal piece or seat member located within each pair ofbrackets and secured therein; and stay-bolt members securing thecrown-sheet and the wrapper-sheet together, having a ball at either endfitting within the spherical-supports of the crown-sheet and in th saidsecuring-yoke bracketnieinbers, whereby the Wrapper-sheet and crownsheetare secured and stayed together upon universal movably jointed bolts.

7. In a steamboiler fire-box construction, a wrapper-sheet; aball-socket spherically cavitied stay-bolt securing journal membersecured in such wrapper-sheet; a stay-bolt provided with a spheroidalball at one end forming with the securing journaha universal ball-joint;a crown-sheet composed of a plurality of substantially ill-shapedmembers, the upstanding flanges of which are secured together andtransversely securing bracket pieces or side-yokes having between themformed thereby a central cylindrical cavity provided with a femalescrew- .thread, such side-yokes being bolted tonesaeao gether upon theflanges oi" the U-shapcd sec: tions oi the crown-sheet; and a universalball-socket ournal nece adapted to be .i L I I L screwed down into thecavity oithe twoyoke members upon a ball on the inner end oi astay-bolt, which is secured, by a like ball at the other end in thesecuring ournal, carried by the wrapper-sheet.

8. In steam-boiler lire-box construction,

a wrapper-sheet; a ball-socket spherically civitied stay-boltjournal-member secured in such wrapp r-sheet; a stay-bolt provided witha spheroidal ball at one end located in the journal, so to form auniversal balljoint, a crown-sheet composed of a plurality of substai lyU-shaped membe the upstanding flanges of wl ich are secur together,having transverse slots; securing bracket pieces or side-yokes having acentral spherical cavity provided with a teale screw-thread boltedtogether upon the flanges of the ill-shaped sections of :1 1ecrown-sheet; and a universal ball-socket journal-piece adapted to bescrewed down into the cavity of the two yoke-members uponra ball formedupon the inner end of a stay-bolt.

9. In a steam-boiler lire-box construction, a wrapper-sheet; aball-socket spherically cavitied stay-bolt journal-member secured insuch wrapper-sheet; a stay-bolt provided with a spheroidal ball at oneend located in the journal, so to form a universal balljoint; acrown-sheet composed of a plurality of substantially U-shaped membe theupstanding flanges of which are secured together, having transverseslots; securing bracket tones or side-yokes having a can. tral s1 ricalcavity provided with a remale cw-thread bolted together upon the flangesof the U-shaped sections of the crown-sheet; and universal ball-socketjournal-piece adapted to be screwed down into the cavity of the twoyoke-members upon a ball formed upon the inner end of a stay-bolt, theball being provided with an undercut central slot; and a securing pinpassing transversely through the two yolzepieces lying in such undercutslot.

10. A steam-boiler fire-box consruction, comprising a wrapper-sheet; acrownsheet composer of longitudinal substantially U- shaped sections,spherical cavitied-ball journals carried by the wrapper-sheet; bracketsor securing side yoke-pieces adapted to be secured to the side walls orflanges of the crown-sheet sections so as to secure the same togetherwhen arranged on oppo site sides of such side walls, so as to coverslots formed therein, so as to form by the coaction of such sideyoke-pieces or brackets a cylindrical screw threaded sleeve; staymembershaving a ball or cylindrical universal-joint portion at either end, theouter one of which is supported in a spherical support of thewrapper-sheet, and the lower like spherical ball of which is located inthe screw-threaded central sleeve-portion formed between the twobrackets, and is held in place by a male threaded hollow ball-receiv--ing spheroidally cavitied journal-sleeve.

11. A steam-boiler fire-box construction comprising a wrapper-sheet; acrown-sheet composed of longitudinal substantially U shaped sections;spherically cavitied ball journal-supports carried by the wrappersheet;brackets or securing side yoke-pieces adapted to be secured to the sidewalls or flanges of the crown-sheet sections so as to secure the sametogether when arranged on opposite sides of such side walls or flanges,so as to' cover slots formed therein, so as to form by the coaction ofsuch side-yoke pieces or brackets, a cylindrical screwthreaded sleeve;stay-members having a spheroidal universal-joint portion at either end,the outer one of which is'supported in a spherical cavitied journalsupportof the wrapper-sheet, and having the lower like spherical balllocated in the screw-threaded central sleeve portionformed between theside-yoke pieces or brackets, which lower ball is held in place by amale threaded hollow ball-receiving spheroidally cavitiedjournal-sleeve, the lower ball so held in place being provided with acentral underout groove to receive a securing rivet-bolt lying in suchslot passing through the sideyokes or bracket pieces.

12. A fire-box construction comprising a wrapper-sheet; a crown-sheetcomposed of a plurality of sections having upstanding flanges at theirabutting joints; spherically cavitied ball-j ournal supports carriedbythe wrapper-sheet; securing side yoke-pieces or brackets comprising earscarrying a half sleeve between them, saidbracket or. side yoke piecesbeing arranged on opposite sides of the upstanding flanges of theabutting crown-sheet sections, so that the semi-circular parts of thesplit-sleeves thereof together form a cylindrical chamber, the ears orend pieces of thes de-yokes or brackets being attached to the upstandingflanges; and stay members having a spherical portion at either endfitting within the said: cylindrical chamber at one. end and thecavitied ball-journal supports of the wrapper sheet at the other;whereby the wrapper-sheet and crown-sheet are universally movablymounted in relation to each other, for movable temperature expansive andcontractive adjustment without. strain.

13. A fire-box construction comprising a a crown-sheet composed ofhaving upstanding flanges at their abutting joints;' sphericallycavitied ball-journal supports carried by the wrapper-sheet; side-yoke.or bracket pieces having a central semiscylindrical sleeveporwrapper-sheet plurality of moved portions.

attached to opposite sides of the uption,

flanges whereby they together form standing a sleeve provided withaninternal screw 'thread; a bushing having external screw threadssleeves spher1cal-port1on having a hollow cavitied located in thesplit-sleevev thus formed and stay-members or bolts hav ing' asphericalportion at either end, one end fitting within the spherical supportscarried by the wrapper-sheet, and the other end held within thesleevesby thespherica'l cavitied portion of the male threaded bushing.7. I 7

14. A'fire-box construction comprising a wrapper-sheet composed ofaplurality of sections having connecting. side-securing flanges arrangedat a right angle to the main central portion; a crown-sheet composed ofa plurality of sections similarto the wrapper-sheet sections having thesecuring flanges of the crown-sheet and wrappersheet arranged parallelbut staggered; spherical cavitied supports carried by thewrapper-sheet-between the flanges; spherically cavitied supports carriedby the flanges or" the crown-sheet; and stay-members in the form ofbolts each having a sphericalportion at either end fitting within. thesaid supports; wherebythe wrapper-sheet and crown-sheet are universallymovably mounted in relation to each other. i r

15. A fire-box construction comprising a wrapper-sheet; and acrown-sheeticomposed of a plurality of sections having upstandingsecuring side flangesythesaid flanges having portions of metal-removedtherefrom at a plurality of points at the outer portion,

and stay bolt vjournal securing members mountedin'the recesses formed bysaid removed portions for the-reception of'stay bolt journal securingmembers.

16, A fire-box construction comprising a wrapper-sheet; and acrown-sheetcomposed of a plurality of sections having upstanding securing sideflanges the said flanges having portions of metal removed-therefrom-at aplurality of points at the outerjportion whereby the flanges have adiflerent' height at a plurality of points, and-stay bolt ournalsecuring members mounted in there cesses formed by said removedportions' 17., A fire-box constru'ctioncomprising' a wrappeirsheet, anda crown-sheet composed of a pluralityof substantially flat-bottomed Ushaped sections, U shaped sections being provided with, a slots made inthe upper edges thereof, whereby the said vertical legs have a differentheight at a plurality of points, and stay bolt journal securing membersmounted in the recesses formed bysaid re-' 18. A boiler fireboxconstruction comprising a wrapper-sheet; a sectional crownsheet composedof a plurality of-substanthe vertical legs of the.

tially U shaped sections; the adjacent abutting securing flanges of suchsections hav ing a stay sheet interposed between them; securing rivetspassingthrough such side flanges and interposed stay-sheet; side-yoke orbracket-members attached to the members of the crown-sheet section; andstay bolts or members connected by a universal joint at one end to theflanges of the crownsheet; and at the other end in a like manner to thewrapper-sheet.

19. A boiler-firebox construction comp ising a sectional crown-sheetcomposed of a plurality of substantially Ushaped sections, the adjacentabutting securing flangesor side walls oflwhich' abutting sections havea stay-sheet interposed between; a sectional crown-sheet formed of likeshaped sections; securing rivets passing through such side flanges andinterposed stay-sheet of the sectional wrapper-sheet and sectionalcrown-sheet; side-yoke or brachet-men'ibers attached to the flan es ofthe crown-sheet sections; and stay-bolts or members connected by auniversal joint at one end to each of the side yolces or" the bracketmem bers attached to the crownsheet section flanges; and attached at theother end in a. like manner by universal-joints to the wrapper-sheet.

20. A boiler flre-box construction comprised of a plurality ofsubstantially fla bottomed U shaped sections, which when securedtogether at the flanged or leg portions, constitute a sectionally formedcrown-sheet and sidewall member of the fire-box; the substantiallyhorizontal crown-sheet portion, and the side-wall portion being eachprovided with expansion slots in the flange and with universal-jointcaviticd bracketpieces secured thereto forming ball-joun nal sockets; ineach of which is universally mounted the ball of stay-bolt extendingoutward from-the crown-sheet or the side furnace-wall, and secured tothe wrappersheet by a like universal stay-bolt joint.

21. In combination, a wrapper-sheet comprising channel members havinginwardly turned flanges abutting the flanges of the adjacent sections; acrown-sheet comprising channel sections having outwardly turned sideflanges abutting the flanges of the adjacent crown-sheet sections andstaggered 'with the flanges of the wrapper-sheet sections; and staybolts having universal connection with sald outturned flanges and the1ntramarg1nal portion of the wrapper sheet sections.

22. In combination, wrapper-sheet sectlons comprlsing channel membershaving inwardly turned flanges abutting the flanges of the wrapper sheetsections.

23. In combination, a wrapper sheet; crown-sheet sections havinoutturned flanges secured to-thc flanges or the adjacent sections, andprovided with registering cut out portions at the edges, and with slotsextending to near the yoke portion of the section and communicating withsaid cutout portion; and stay bolts having connection with saidoutturned flanges and the wrapper sheet.

2%, In combination, a wrapper sheet; a crown-sheet comprising sectionshaving out turned flanges secured to the flanges of the adjacentsections, and provided with registering transverse slots extending tonear the yoke portion of the section; and stay bolts having connectionwith said outturnet flanges and the wrapper-sheet.

A crown-sheet comprising sections having outturned flanges secured theflanges oi the adjacent sections, and provided with transverseregistering slets er;- tending to near the yoke portion of the section.

26. In combination, a wrapper-sheet; crown-sheet channel sections havingoutwardly turned side flanges secured to the flanges of the adjacentcrown-sheet sections and provided with registering rectangular cut-outportions at the edges; a socket seated in each cut-out portion; and staybolts having universal connection with said wrap aer, sheet and saidsockets.

27. In combination, a wrapper-sheet; crown-sheet channel sections havingside flanges abutting the flanges of the adjacent sections and providedwith registering cutout portions; a socket seated in each cut-outportion; and stay bolts having connection with said Wrapper-sheet andsaid sockets.

28. In combination, spaced sheets, one of which comprises channelsections having side flanges abutting the flanges of the adjacentsections and provided with registering rectangular cut-out portions; andstay bolts having connection with said sheets and one end seated in saidcut out portion.

29. In combination, spaced sheets, one of which comprises channelsections having side flanges provided with cut out portions; and staybolts having connection with said sheets and one end in said out outportion.

30. In combination, a wrapper sheet; crown -sheet sections havingoutturned flanges secured to the flanges of the adjacent se-itions, andprovided with registering cut out portions at the edges; a pair ofbracket members secured at their opposite ends to the side face ofadjacent flanges at said cutaway portions and provided with opposedcavities together forming a threaded sleeve; a threaded bushing in saidsleeve and cutaway portion and provided with a spherical interior socketsurface: a transverse pin diametrical to the lower part of said sleeveand holding the bracket members from spreading apart; and a plurality ofstay bolts, each having universal connection at its outer end With theWrapper sheet and a substantially spherical inner end received by saidsocket surface and provided with. a transverse end groove receiving saidpin.

Si. in combination a pair of sheets one oi which comprises sectionshaving flanges secured to the flanges of the adjacent sections, andprovided With registering cut-out portions at-the edges; bracket membersse crown-sheet; a plurality o1 stay bolts con-c nected to thecrown-sheet and each having a threaded outer end; exteriorly threadedsocket sleeves having spherical sockets in their outer ends and havingreduced threaded inner ends received in said intra-marginal openings;ball shaped nuts received on the outer ends of said stay bolts andseated in said sockets; and interiorly threaded caps adjacent sections;a crown-sheet;

mounted on the outer ends of said Socket 7 sleeves and covering saidnuts.

33.1n combination, Wrapper-sheet sections comprising channel membershaving intra marginal openings and inwardly turned flanges secured. tothe flanges of the a P rality of stay bolts connected to the crownsheetand each having a threaded outer end;

socket sleeves having spherical sockets in their outer ends and havingreduced ends received in said intramarginal openings respectively; andba1l-shaped nuts received on the outer ends of said stay bolts andseated in said sockets. I

34;. In'combination a Wrapper-sheet comprising sections having inturnedflanges se-" cured to the flanges of the adjacent sections; crown-sheetchannel sections having outwardly turned side flanges abutting theflanges of the adjacent crown-sheet sections; stay bolts havinguniversal connection With said outturned flanges and theintra-marginal'portion of the Wrapper-sheet sections;

and rivets passing through adjacent flanges of the crown-sheet sectionsbetween the uni versal connection and the body portion of the sectionand holding the flanges in steamtight contact throughout. V CHARLESDUCAS. Witnesses:

H. A. PATTISON; H. D. PENNEY.

R. N. EHRHART.

CONDENSER. APPLICATION FILED NOV- H. 19!- ZL 35 6QLQ Patented Sept. 21,1929.,

